Merge pull request #844 from timmartin/issue843

Fix incorrect MRO being calculated for scoped multiple inheritance

ChangeLog

@@ -53,6 +53,10 @@ Release Date: TBA
 
 * Fixed exception-chaining error messages.
 
+* Fix failure to infer base class type with multiple inheritance and qualified names
+
+  Fixes #843
+
 * Reduce memory usage of astroid's module cache.
 
 What's New in astroid 2.4.3?

astroid/scoped_nodes.py

@@ -2858,7 +2858,7 @@ def _inferred_bases(self, context=None):
 
         for stmt in self.bases:
             try:
-                baseobj = next(stmt.infer(context=context))
+                baseobj = next(stmt.infer(context=context.clone()))
             except exceptions.InferenceError:
                 continue
             if isinstance(baseobj, bases.Instance):

tests/unittest_scoped_nodes.py

@@ -1417,6 +1417,22 @@ def __init__(self):
             ],
         )
 
+    def test_mro_with_attribute_classes(self):
+        cls = builder.extract_node(
+            """
+        class A:
+            pass
+        class B:
+            pass
+        scope = object()
+        scope.A = A
+        scope.B = B
+        class C(scope.A, scope.B):
+            pass
+        """
+        )
+        self.assertEqualMro(cls, ["C", "A", "B", "object"])
+
     def test_generator_from_infer_call_result_parent(self):
         func = builder.extract_node(
             """